TABLE 1.

Resistance genes and plasmid replicon types of NDM-1-producing isolates

NDM-producing isolates (no.)	No. (%) of antibiotic resistance genes								Plasmid replicon type(s) (no.)
	β-Lactamasesa				16S rRNA methylases
	blaCMY-2	blaCTX-M-15	blaSHV blaTEM	blaOXA-1	rmtB	rmtC	rmtF	armA
Escherichia coli (30)	26 (87)	16 (53)	0, 19 (63)	9 (30)	8 (27)	20 (67)	0	15 (50)	IncHI1 (10), IncI1 (2), IncL/M (2), IncN (4), IncFIA (5), IncFIB (6), IncY (2), IncA/C (25), IncFII (9)
Enterobacter cloacae (21)	16 (76)	21 (100)	0, 20 (95)	20 (95)	0	15 (71)	0	14 (67)	IncA/C (19), untypeable (2)
Citrobacter freundii (4)	3 (75)	2 (50)	0, 2 (50)	2 (50)	0	0	0	1 (14)	IncA/C (2), IncFII (1), untypeable (1)
Acinetobacter baumannii (3)	0	0	0	0	0	0	0	0	NDb
Klebsiella pneumoniae (3)	1 (33)	3 (100)	3 (100), 3 (100)	3 (100)		1 (33)	0	1 (33)	IncN (1), IncA/C (1), untypeable (1)
Pseudocitrobacter faecalis (2)	0	2 (100)	0, 2 (100)	2 (100)	0	0	0	0	IncN (2)
Providencia rettgeri (2)	2 (100)	0	0, 0	1 (50)	0	1 (50)	0	2 (100)	IncA/C (1), IncN (2), IncY (1)
Citrobacter braakii (1)	1 (100)	0	0, 0	0	0	1 (100)	0	0	IncA/C (1)
Total no. of isolatesc	49 (78)	44 (70)	3 (5), 46 (73)	37 (59)	8 (13)	38 (60)	0	33 (52)	IncA/C (49)

^aAll isolates were negative for bla_OXA-48, bla_IMP, bla_VIM, and bla_KPC.

^bND, not determined.

^cA. baumannii excluded from this total.